<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>作业3</title>
    <style type="text/css">
        div{
            margin-top: 20px;
        }
        #box1{
            text-shadow: 5px 8px 3px blue;
        }
        #txt{
            width: 250px;
            height: 200px;
            background: forestgreen;
            word-wrap: break-word;
        }
    </style>
</head>
<body>
    <div id="box1">我是文本阴影</div>
    <p id="txt">Thisisalongtext ThisisalongtextThisisalongtextThisisalongtext
        Thisisalongtext ThisisalongtextThisisalongtext Thisisalongtext<p>
</body>
</html>